J Clin Med Res

Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access

Article copyright, the authors; Journal compilation copyright, J Clin Med Res and Elmer Press Inc

Journal website http://www.jocmr.org

Original Article

Volume 1, Number 3, August 2009, pages 158-164

Prevalence of Temporomandibular Joint Disorders Among Students of the University of Jordan

**Table 1.** Factors associated with TMD symptoms in the study sample
Factor		Clicking	Trismus	Pain about the ear	Locking	Pain on chewing
* P value of Chi square, ** Living with family
Age/years	18-19	139	39.4	0.14	68	19.3	0.18	166	47.0	0.23	51	14.4	0.28	128	36.3	0.16
20-21	235	42.9	137	25.0	258	47.1	85	15.5	215	39.2
22-23	83	49.4	42	25.0	65	38.7	19	11.3	62	36.9
24-25	12	35.3	6	17.6	14	41.2	2	5.9	7	20.6
Gender	Male	122	44.2	0.51	58	21.0	0.38	96	34.8	<0.01	42	15.2	0.59	103	37.3	0.99
Female	347	42.0	195	23.6	407	49.2	115	13.9	309	37.4
College	Humanity	169	35.1	<0.01	91	18.9	<0.01	231	47.9	<0.01	64	13.3	<0.01	164	34.0	<0.01
Science	73	44.8	51	31.3	94	57.7	39	23.9	90	55.2
Health	227	49.6	111	24.2	178	38.9	54	11.8	158	34.5
Trauma	No	412	41.3	0.01	210	21.0	<0.01	435	43.6	<0.01	123	12.3	<0.01	346	34.7	<0.01
Yes	57	54.3	43	41.0	68	64.8	34	32.4	66	62.9
Arthralgia	No	314	38.7	<0.01	154	19.0	<0.01	312	38.5	<0.01	92	11.3	<0.01	250	30.8	<0.01
Yes	155	53.1	99	33.9	191	65.4	65	22.3	162	55.5
Stress	No	178	33.1	<0.01	84	15.6	<0.01	190	35.4	<0.01	39	7.3	<0.01	132	24.6	<0.01
Yes	291	51.4	169	29.9	313	55.3	118	20.8	280	49.5
Family**	No	70	42.5	0.47	33	21.4	0.63	56	36.4	0.01	24	15.6	0.6	61	39.6	0.53
Yes	399	42.0	220	23.2	447	47.1	133	14.0		37.0

Table 1. Factors associated with TMD symptoms in the study sample

Factor

Clicking

Trismus

Pain about the ear

Locking

Pain on chewing

No.

* P value of Chi square, ** Living with family

Age/years

18-19

139

39.4

0.14

19.3

0.18

166

47.0

0.23

14.4

0.28

128

36.3

0.16

20-21

235

42.9

137

25.0

258

47.1

15.5

215

39.2

22-23

49.4

25.0

38.7

11.3

36.9

24-25

35.3

17.6

41.2

5.9

20.6

Gender

Male

122

44.2

0.51

21.0

0.38

34.8

<0.01

15.2

0.59

103

37.3

0.99

Female

347

42.0

195

23.6

407

49.2

115

13.9

309

37.4

College

Humanity

169

35.1

<0.01

18.9

<0.01

231

47.9

<0.01

13.3

<0.01

164

34.0

<0.01

Science

44.8

31.3

57.7

23.9

55.2

Health

227

49.6

111

24.2

178

38.9

11.8

158

34.5

Trauma

412

41.3

0.01

210

21.0

<0.01

435

43.6

<0.01

123

12.3

<0.01

346

34.7

<0.01

Yes

54.3

41.0

64.8

32.4

62.9

Arthralgia

314

38.7

<0.01

154

19.0

<0.01

312

38.5

<0.01

11.3

<0.01

250

30.8

<0.01

Yes

155

53.1

33.9

191

65.4

22.3

162

55.5

Stress

178

33.1

<0.01

15.6

<0.01

190

35.4

<0.01

7.3

<0.01

132

24.6

<0.01

Yes

291

51.4

169

29.9

313

55.3

118

20.8

280

49.5

Family**

42.5

0.47

21.4

0.63

36.4

0.01

15.6

0.6

39.6

0.53

Yes

399

42.0

220

23.2

447

47.1

133

14.0

37.0

**Table 2.** Stepwise logistic regression modelling for factors associated with TMD symptoms
TMD symptom	Variable	Regression Coefficient	P-value	OR
Clicking	College type		<0.01
Humanity	Reference category	1.00
Science	0.349	0.06	1.42	0.98-2.05
Health	0.622	<0.01	1.86	1.42-2.45
Positive history of trauma	0.486	0.02	1.63	1.07-2.47
Arthralgia in other joints	0.442	<0.01	1.56	1.16-2.08
Stress	0.579	<0.01	1.78	1.38-2.31
Trismus	College type		<0.01
Humanity	Reference category	1.00
Science	0.630	<0.01	1.88	1.24-2.85
Health	0.374	0.03	1.45	1.05-2.02
Positive history of trauma	0.872	<0.01	2.39	1.55-3.69
Arthralgia in other joints	0.562	<0.01	1.76	1.27-2.42
Stress	0.617	<0.01	1.85	1.36-2.53
Pain in or about ears	College type		<0.01
Humanity	Reference category	1.00
Science	0.424	0.03	1.53	1.04-2.24
Health	-0.273	0.06	0.76	0.58-1.01
Positive history of trauma	0.734	<0.01	2.08	1.34-3.25
Arthralgia in other joints	0.822	<0.01	2.28	1.69-3.07
Stress	0.647	<0.01	1.91	1.47-2.49
Males	0.632	<0.01	1.88	1.39-2.55
Locking	College type		<0.01
Humanity	Reference category	1.00
Science	0.664	<0.01	1.94	1.22-3.09
Health	-0.204	0.32	0.82	0.55-1.22
Positive history of trauma	1.125	<0.01	3.08	1.93-4.92
Stress	1.196	<0.01	3.31	2.23-4.89
Pain on chewing	College type		<0.01
Humanity	Reference category	1.00
Science	0.860	<0.01	2.36	1.61-3.47
Health	0.039	0.79	1.04	0.78-1.39
Positive history of trauma	1.038	<0.01	2.82	1.82-4.39
Arthralgia in other joints	0.696	<0.01	2.01	1.49-2.70
Stress	0.916	<0.01	2.5	1.90-3.29

Table 2. Stepwise logistic regression modelling for factors associated with TMD symptoms

TMD symptom

Variable

Regression Coefficient

P-value

Confidence limits for OR

Clicking

College type

<0.01

Humanity

Reference category

1.00

Science

0.349

0.06

1.42

0.98-2.05

Health

0.622

<0.01

1.86

1.42-2.45

Positive history of trauma

0.486

0.02

1.63

1.07-2.47

Arthralgia in other joints

0.442

<0.01

1.56

1.16-2.08

Stress

0.579

<0.01

1.78

1.38-2.31

Trismus

College type

<0.01

Humanity

Reference category

1.00

Science

0.630

<0.01

1.88

1.24-2.85

Health

0.374

0.03

1.45

1.05-2.02

Positive history of trauma

0.872

<0.01

2.39

1.55-3.69

Arthralgia in other joints

0.562

<0.01

1.76

1.27-2.42

Stress

0.617

<0.01

1.85

1.36-2.53

Pain in or about ears

College type

<0.01

Humanity

Reference category

1.00

Science

0.424

0.03

1.53

1.04-2.24

Health

-0.273

0.06

0.76

0.58-1.01

Positive history of trauma

0.734

<0.01

2.08

1.34-3.25

Arthralgia in other joints

0.822

<0.01

2.28

1.69-3.07

Stress

0.647

<0.01

1.91

1.47-2.49

Males

0.632

<0.01

1.88

1.39-2.55

Locking

College type

<0.01

Humanity

Reference category

1.00

Science

0.664

<0.01

1.94

1.22-3.09

Health

-0.204

0.32

0.82

0.55-1.22

Positive history of trauma

1.125

<0.01

3.08

1.93-4.92

Stress

1.196

<0.01

3.31

2.23-4.89

Pain on chewing

College type

<0.01

Humanity

Reference category

1.00

Science

0.860

<0.01

2.36

1.61-3.47

Health

0.039

0.79

1.04

0.78-1.39

Positive history of trauma

1.038

<0.01

2.82

1.82-4.39

Arthralgia in other joints

0.696

<0.01

2.01

1.49-2.70

Stress

0.916

<0.01

2.5

1.90-3.29